Keyword: hardware
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MOPOB25 The Use of KF Style Flanges in Low Particlulate Applications ion, vacuum, diagnostics, cavity 124
 
  • K.R. Kendziora, J.J. Angelo, C.M. Baffes, D. Franck, R.J. Kellett
    Fermilab, Batavia, Illinois, USA
  
  Funding: Fermilab, Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy
As SCRF particle accelerator technology advances the need for 'low particulate' and 'particle free' vacuum systems becomes greater and greater. In the course of the operation of these systems, there comes a time when vari-ous instruments have to be temporarily attached for diag-nostic purposes: RGAs, leak detectors, and additional pumps. In an effort to make the additions of these instru-ments easier and more time effective, we propose to use KF style flanges for these types of temporary diagnostic connections. This document will describe the tests used to compare the particles generated using the assembly of the, widely accepted for 'particle free' use, conflat flange to the proposed KF style flange, and demonstrate that KF flanges produce less particles. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-MOPOB25  
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TUPOA40 Low Noise Digitizer Design for LCLS-II LLRF ion, FPGA, LLRF, cavity 364
 
  • G. Huang, L.R. Doolittle, Y.L. Xu, J. Yang
    LBNL, Berkeley, California, USA
  • Y.L. Xu, J. Yang
    TUB, Beijing, People's Republic of China
  
  Modern accelerators use a digital low level RF controller to stabilize the fields in accelerator cavities. The noise in the receiver chain and analog to digital conversion (ADC) for the cavity probe signal is critically important. Within the closed-loop bandwidth, it will eventually become part of the field noise seen by the beam in the accelerator. Above the open-loop cavity bandwidth, feedback processes transfer that noise to the high power drive amplifiers. The LCLS-II project is expected to use an undulator to provide soft X-rays based on a stable electron beam accelerated by a superconducting linac. Project success depends on a low noise, low crosstalk analog to digital conversion. We developed a digitizer board with 8 ADC channels and 2 DAC channels. The broadband phase noise of this board is measured at <-151\thinspace dBc/Hz, and the adjacent channel crosstalk is measured at <-80\thinspace dB. In this paper we describe the digitizer board design, performance test procedures, and bench-test results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOA40  
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TUPOA52 Updates to the Low-Level RF Architecture for Fermilab ion, controls, LLRF, simulation 394
 
  • J. Einstein, B.E. Chase, E. Cullerton, P. Varghese
    Fermilab, Batavia, Illinois, USA
  • S. Biedron, S.V. Milton
    CSU, Fort Collins, Colorado, USA
  • D. Sharma
    RRCAT, Indore (M.P.), India
  
  Fermilab has teamed with Colorado State University on several projects in LLRF controls and architecture. These projects include new LLRF hardware, updated controls techniques, and new system architectures. Here we present a summary of our work to date.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOA52  
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